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<div class="moz-cite-prefix">... maybe just to add: depending on
which sort of specimens are under storage in your wet collection,
they could either release larger amounts of fatty acids (e.g. in
insect collections with fats leaching out of specimens) or acids
such as formic acid which might dissolve directly out of specimens
which could result in even lower pH values. You mentioned that you
aim to restore on old collection: be careful with old specimen
jars or insects which are sorted to small glass tubes inside jars.
Low pH-values create a highly reactive surface layer on the glass
which not only corrodes the jar surface (you might know this
effect from dishwashers) but also specimens.<br>
<br>
If crustaceans et al. are on storage, the pH might shift to values
around 8 or 9 due to the shells, which producing an likewise
unhealthy environment inside your specimen jar ....<br>
<br>
Best would be to keep the condition stable, i.e. change the fluid
only if there is a real conservation issue that needs to be dealt
with.<br>
<br>
Hope this helps<br>
Dirk <br>
<br>
<br>
Am 18.10.2016 um 22:54 schrieb <a class="moz-txt-link-abbreviated" href="mailto:rw@protectheritage.com">rw@protectheritage.com</a>:<br>
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<div class="WordSection1">
<p class="MsoNormal"><span
style="font-size:12.0pt;font-family:"Calibri",sans-serif;color:#1F497D">Hi
Nicolas,<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:12.0pt;font-family:"Calibri",sans-serif;color:#1F497D">Your
calculation of pH is good. I get 4.22 for 12mg/L and 4.27
for 9.6mg/L so all are in the same ball park.<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:12.0pt;font-family:"Calibri",sans-serif;color:#1F497D">Roughly,
a mg of acetic acid will dissolve about a mg of calcium
carbonate (shell material) or a mg of hydroxyapatite (bone
mineral) so that gives you a sense of how much reaction you
can anticipate: one litre of solution will dissolve about
10mg of each of those materials. Depending on the
composition of specimens and the fluid to specimen ratio
that may or may not be significant.<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:12.0pt;font-family:"Calibri",sans-serif;color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="font-size:12.0pt;font-family:"Calibri",sans-serif;color:#1F497D">I
think Dirk’s suggestion is very sensible. Can you find out
whether or not your water is chlorinated?<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:12.0pt;font-family:"Calibri",sans-serif;color:#1F497D">Best,<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:12.0pt;font-family:"Calibri",sans-serif;color:#1F497D">Rob<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:12.0pt;font-family:"Calibri",sans-serif;color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="font-family:"Calibri",sans-serif;mso-fareast-language:EN-CA">Robert
Waller, PhD, CAPC, FIIC<br>
President and Senior Risk Analyst<br>
Protect Heritage Corp.<br>
622 Simoneau Way<br>
Ottawa ON K4A 1P4<br>
email: </span><span
style="font-family:"Calibri",sans-serif;mso-fareast-language:EN-CA"
lang="EN-US"><a moz-do-not-send="true" href="mailto:rw@protectheritage.com"><span
style="color:#0563C1" lang="EN-CA">rw@protectheritage.com</span></a><br>
</span><span
style="font-family:"Calibri",sans-serif;mso-fareast-language:EN-CA">internet:
</span><span
style="font-family:"Calibri",sans-serif;mso-fareast-language:EN-CA"
lang="EN-US"><a moz-do-not-send="true" href="https://urldefense.proofpoint.com/v2/url?u=http-3A__www.protectheritage.com_&d=CwMD-g&c=-dg2m7zWuuDZ0MUcV7Sdqw&r=CLFZJ3fvGSmDp7xK1dNZfh6uGV_h-8NVlo3fXNoRNzI&m=bBeg_gKbe8Yf6BW0qprgYgn5FgMvClqZrPJDlBD084s&s=GjXGjSCtD_odVc2OSVacxIxnJaIq_fB81ul6xjXzjDc&e="><span
style="color:#0563C1" lang="EN-CA">www.protectheritage.com</span></a><br>
</span><span
style="font-family:"Calibri",sans-serif;mso-fareast-language:EN-CA">phone:
613-883-2707 (Canada)<br>
phone: 303-872-9739 (USA)<br>
skype: rrwaller<br>
<i>and, </i>Research Associate, Canadian Museum of Nature<br>
<i>and,</i> Adjunct Assistant Professor, Queen’s University<br>
<img style="width:.8645in;height:.2812in"
id="Picture_x0020_1"
src="cid:part3.C182D879.515B05E7@zsm.mwn.de"
alt="cid:image003.png@01D16EDD.07D59280" height="27"
border="0" width="83"> <img
style="width:.9895in;height:.302in" id="_x0000_i1028"
src="cid:part4.A9C55E79.AD908E9A@zsm.mwn.de"
alt="http://nature.ca/images/logo_e.jpg" height="29"
border="0" width="95"> <img
style="width:.427in;height:.302in" id="Picture_x0020_3"
src="cid:part5.DB133F9A.90ECAB4B@zsm.mwn.de"
alt="Description:
http://www.queensu.ca/writingcentre/images/QueensLogo.png"
height="29" border="0" width="41"><o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-family:"Calibri",sans-serif;mso-fareast-language:EN-CA">
</span><a moz-do-not-send="true" href="https://urldefense.proofpoint.com/v2/url?u=http-3A__www.facebook.com_ProtectHeritageCorp-3Fref-3Dtn-5Ftnmn&d=CwMD-g&c=-dg2m7zWuuDZ0MUcV7Sdqw&r=CLFZJ3fvGSmDp7xK1dNZfh6uGV_h-8NVlo3fXNoRNzI&m=bBeg_gKbe8Yf6BW0qprgYgn5FgMvClqZrPJDlBD084s&s=k4JW_MWoDcfvwMnlz4ep4P3tQJepchBGriEYvSUiH80&e="><span
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style="width:.9062in;height:.25in" id="Picture_x0020_4"
src="cid:part6.5DC52456.FD9D1F17@zsm.mwn.de"
alt="cid:image006.png@01D16EDD.07D59280" height="24"
border="0" width="87"></span></a><span
style="font-family:"Calibri",sans-serif;mso-fareast-language:EN-CA"> </span><a moz-do-not-send="true" href="https://urldefense.proofpoint.com/v2/url?u=https-3A__twitter.com_-23-2521_ProtectHeritage&d=CwMD-g&c=-dg2m7zWuuDZ0MUcV7Sdqw&r=CLFZJ3fvGSmDp7xK1dNZfh6uGV_h-8NVlo3fXNoRNzI&m=bBeg_gKbe8Yf6BW0qprgYgn5FgMvClqZrPJDlBD084s&s=WqcbftOAApyg0TGPHLp7yCI4nXfzrg13GDUbKuQff9s&e="><span
style="font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-CA;text-decoration:none"><img
style="width:.6875in;height:.25in" id="Picture_x0020_2"
src="cid:part8.5D37F2D5.59A6D2A5@zsm.mwn.de"
alt="cid:image007.png@01D16EDD.07D59280" height="24"
border="0" width="66"></span></a><span
style="font-family:"Calibri",sans-serif;mso-fareast-language:EN-CA"
lang="EN-US"><o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-family:"Calibri",sans-serif;mso-fareast-language:EN-CA"><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-CA">
</span><span
style="font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-CA"><o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:12.0pt;font-family:"Calibri",sans-serif;color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="font-size:12.0pt;font-family:"Calibri",sans-serif;color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="font-size:12.0pt;font-family:"Calibri",sans-serif;color:#1F497D"><o:p> </o:p></span></p>
<div>
<div style="border:none;border-top:solid #E1E1E1
1.0pt;padding:3.0pt 0cm 0cm 0cm">
<p class="MsoNormal"><b><span
style="font-family:"Calibri",sans-serif;color:windowtext;mso-fareast-language:EN-CA"
lang="EN-US">From:</span></b><span
style="font-family:"Calibri",sans-serif;color:windowtext;mso-fareast-language:EN-CA"
lang="EN-US"> <a class="moz-txt-link-abbreviated" href="mailto:nhcoll-l-bounces@mailman.yale.edu">nhcoll-l-bounces@mailman.yale.edu</a>
[<a class="moz-txt-link-freetext" href="mailto:nhcoll-l-bounces@mailman.yale.edu">mailto:nhcoll-l-bounces@mailman.yale.edu</a>] <b>On Behalf
Of </b>Dirk Neumann<br>
<b>Sent:</b> October 18, 2016 10:32 AM<br>
<b>To:</b> <a class="moz-txt-link-abbreviated" href="mailto:nhcoll-l@mailman.yale.edu">nhcoll-l@mailman.yale.edu</a>; Margraf Nicolas
<a class="moz-txt-link-rfc2396E" href="mailto:Nicolas.Margraf@ne.ch"><Nicolas.Margraf@ne.ch></a><br>
<b>Subject:</b> Re: [Nhcoll-l] Acidity in alcohol<o:p></o:p></span></p>
</div>
</div>
<p class="MsoNormal"><o:p> </o:p></p>
<div>
<p class="MsoNormal">Dear Nicolas,<br>
<br>
<br>
it might be worth to compare the attached paper; my
colleague did some tests which are summarized therein.
Normal pH-paper tests will not work, you need to dilute the
alcohol to get reliable measurements (see attached paper).<br>
<br>
If your tap water is not chlorinated and pure but
calciferous, you might dilute your 96% EthOH with tap water
to 80%; the dilution needs to rest for at least one day, as
calcium carbonate starts to precipitate; the residual
carbonate in solution gives you some sort of buffer
capacity.<br>
<br>
Hope this helps<br>
Dirk<br>
<br>
<br>
Am 18.10.2016 um 16:00 schrieb Margraf Nicolas:<span
style="font-size:12.0pt;mso-fareast-language:EN-CA"><o:p></o:p></span></p>
</div>
<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">
<p class="MsoPlainText"><span style="font-family:"Courier
New",serif" lang="EN-US">Dear all,</span><o:p></o:p></p>
<p class="MsoPlainText"><span style="font-family:"Courier
New",serif" lang="EN-US">The MHNC is a small natural
history museum located in the hearth of the Jura Mountains
in La Chaux-de-Fonds, Switzerland. The MHNC team is
currently re-conditioning the alcohol collection, changing
containers and alcohol using an 80% Ethanol solution. The
team was told to check the acidity of the alcoholic
solution as acidity is not good for the specimens but had
trouble doing so.</span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-family:"Courier
New",serif" lang="EN-US">Is a 9.6 mg/l acidity
expressed as acetic acid too acidic? (12 mg/l in 96% Et-OH
diluted to 4/5)</span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-family:"Courier
New",serif" lang="EN-US">Additional questions:</span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-family:"Courier
New",serif" lang="EN-US">The alcohol dealer was asked
about the acidity of the 96% Ethanol he provides us with.
The value he gave us is 12 mg/l of acidity expressed as
acetic acid. We tried to calculate the pH based on that
value and obtain a value of 4.23. Does that sound right?</span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-family:"Courier
New",serif" lang="EN-US">We tried measuring the pH of
the solution with both pH-paper and a pH-meter and found
conflicting values. Is the pH-paper reading valid for an
alcoholic solution? Or is the pH-meter value valid for an
alcoholic solution?</span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-family:"Courier
New",serif" lang="EN-US">A pH of 4.23 seems too
acidic to preserve specimens so we tried to calculate the
amount of Na2CO3 necessary to neutralize the 12 mg/l of
CH3COOH and obtain 10.6 mg/l. Is it correct (and
sufficient) to add this amount of Na2CO3 to every liter of
our 96% Et-OH solution?</span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-family:"Courier
New",serif" lang="EN-US">Any advice or help would be
greatly appreciated.</span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-family:"Courier
New",serif">Thanks,</span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-family:"Courier
New",serif">Sincerely,</span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-family:"Courier
New",serif">N</span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-family:"Courier
New",serif">*****************************************</span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-family:"Courier
New",serif">Nicolas Margraf </span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-family:"Courier
New",serif">Collaborateur scientifique</span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-family:"Courier
New",serif">Musée d'histoire naturelle de La
Chaux-de-Fonds</span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-family:"Courier
New",serif">Av. Léopold-Robert 63 - CH 2300 LA
CHAUX-DE-FONDS</span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-family:"Courier
New",serif">T +41 (0)32 967 60 71 - <a moz-do-not-send="true" href="mailto:mhnc@ne.ch">mhnc@ne.ch</a></span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-family:"Courier
New",serif"><a moz-do-not-send="true" href="https://urldefense.proofpoint.com/v2/url?u=http-3A__www.mhnc.ch&d=CwMD-g&c=-dg2m7zWuuDZ0MUcV7Sdqw&r=CLFZJ3fvGSmDp7xK1dNZfh6uGV_h-8NVlo3fXNoRNzI&m=awiDiMv0NtCLLz5-uNP7bpumXx_y47hSNPzjP1ztGHQ&s=j_kCUhBRpi6St_0mk54mrv-AsRO2bu6fk98EjYXHooQ&e=">www.mhnc.ch</a></span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-family:"Courier
New",serif"> </span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-family:"Courier
New",serif"> </span><o:p></o:p></p>
<p class="MsoNormal"><span
style="font-size:12.0pt;font-family:"Times New
Roman",serif;mso-fareast-language:EN-CA"><br>
<br>
<br>
<o:p></o:p></span></p>
<pre>_______________________________________________<o:p></o:p></pre>
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<pre>mission is to improve the preservation, conservation and management of<o:p></o:p></pre>
<pre>natural history collections to ensure their continuing value to<o:p></o:p></pre>
<pre>society. See <a moz-do-not-send="true" href="https://urldefense.proofpoint.com/v2/url?u=http-3A__www.spnhc.org&d=CwMD-g&c=-dg2m7zWuuDZ0MUcV7Sdqw&r=CLFZJ3fvGSmDp7xK1dNZfh6uGV_h-8NVlo3fXNoRNzI&m=awiDiMv0NtCLLz5-uNP7bpumXx_y47hSNPzjP1ztGHQ&s=ah02X65SM_HBrY5-9DCrbp-5750s6QV7TN5G1ffufrM&e=">http://www.spnhc.org</a> for membership information.<o:p></o:p></pre>
<pre>Advertising on NH-COLL-L is inappropriate.<o:p></o:p></pre>
</blockquote>
<p class="MsoNormal"><span
style="font-size:12.0pt;font-family:"Times New
Roman",serif;mso-fareast-language:EN-CA"><o:p> </o:p></span></p>
<p><o:p> </o:p></p>
<pre>-- <o:p></o:p></pre>
<pre>Dirk Neumann<o:p></o:p></pre>
<pre><o:p> </o:p></pre>
<pre>Tel: 089 / 8107-111<o:p></o:p></pre>
<pre>Fax: 089 / 8107-300<o:p></o:p></pre>
<pre>email: Dirk.Neumann(a)zsm.mwn.de<o:p></o:p></pre>
<pre><o:p> </o:p></pre>
<pre>Postanschrift:<o:p></o:p></pre>
<pre><o:p> </o:p></pre>
<pre>Staatliche Naturwissenschaftliche Sammlungen Bayerns<o:p></o:p></pre>
<pre>Zoologische Staatssammlung München<o:p></o:p></pre>
<pre>Dirk Neumann, Sektion Ichthyologie / DNA-Labor<o:p></o:p></pre>
<pre>Münchhausenstr. 21<o:p></o:p></pre>
<pre>81247 München<o:p></o:p></pre>
<pre><o:p> </o:p></pre>
<pre>Besuchen Sie unsere Sammlung:<o:p></o:p></pre>
<pre><a moz-do-not-send="true" href="https://urldefense.proofpoint.com/v2/url?u=http-3A__www.zsm.mwn.de_ich_&d=CwMD-g&c=-dg2m7zWuuDZ0MUcV7Sdqw&r=CLFZJ3fvGSmDp7xK1dNZfh6uGV_h-8NVlo3fXNoRNzI&m=awiDiMv0NtCLLz5-uNP7bpumXx_y47hSNPzjP1ztGHQ&s=ZAb7gDSyAGwhQGWD5e_OD-UJZa03v9DimjLmwivi2aM&e=">http://www.zsm.mwn.de/ich/</a><o:p></o:p></pre>
<pre><o:p> </o:p></pre>
<pre>---------<o:p></o:p></pre>
<pre><o:p> </o:p></pre>
<pre>Dirk Neumann<o:p></o:p></pre>
<pre><o:p> </o:p></pre>
<pre>Tel: +49-89-8107-111<o:p></o:p></pre>
<pre>Fax: +49-89-8107-300<o:p></o:p></pre>
<pre>email: Dirk.Neumann(a)zsm.mwn.de<o:p></o:p></pre>
<pre><o:p> </o:p></pre>
<pre>postal address:<o:p></o:p></pre>
<pre><o:p> </o:p></pre>
<pre>Bavarian Natural History Collections<o:p></o:p></pre>
<pre>The Bavarian State Collection of Zoology<o:p></o:p></pre>
<pre>Dirk Neumann, Section Ichthyology / DNA-Lab<o:p></o:p></pre>
<pre>Muenchhausenstr. 21<o:p></o:p></pre>
<pre>81247 Munich (Germany)<o:p></o:p></pre>
<pre><o:p> </o:p></pre>
<pre>Visit our section at:<o:p></o:p></pre>
<pre><a moz-do-not-send="true" href="https://urldefense.proofpoint.com/v2/url?u=http-3A__www.zsm.mwn.de_ich_&d=CwMD-g&c=-dg2m7zWuuDZ0MUcV7Sdqw&r=CLFZJ3fvGSmDp7xK1dNZfh6uGV_h-8NVlo3fXNoRNzI&m=awiDiMv0NtCLLz5-uNP7bpumXx_y47hSNPzjP1ztGHQ&s=ZAb7gDSyAGwhQGWD5e_OD-UJZa03v9DimjLmwivi2aM&e=">http://www.zsm.mwn.de/ich/</a><o:p></o:p></pre>
<pre><o:p> </o:p></pre>
<pre><o:p> </o:p></pre>
<pre><o:p> </o:p></pre>
</div>
</blockquote>
<br>
<p><br>
</p>
<pre class="moz-signature" cols="72">--
Dirk Neumann
Tel: 089 / 8107-111
Fax: 089 / 8107-300
email: Dirk.Neumann(a)zsm.mwn.de
Postanschrift:
Staatliche Naturwissenschaftliche Sammlungen Bayerns
Zoologische Staatssammlung München
Dirk Neumann, Sektion Ichthyologie / DNA-Labor
Münchhausenstr. 21
81247 München
Besuchen Sie unsere Sammlung:
<a class="moz-txt-link-freetext" href="https://urldefense.proofpoint.com/v2/url?u=http-3A__www.zsm.mwn.de_ich_&d=CwMD-g&c=-dg2m7zWuuDZ0MUcV7Sdqw&r=CLFZJ3fvGSmDp7xK1dNZfh6uGV_h-8NVlo3fXNoRNzI&m=bBeg_gKbe8Yf6BW0qprgYgn5FgMvClqZrPJDlBD084s&s=zKPWJ2tIjj77TkLi6GRhu0NjSv5FXZuxtKF09RhyMe4&e=">http://www.zsm.mwn.de/ich/</a>
---------
Dirk Neumann
Tel: +49-89-8107-111
Fax: +49-89-8107-300
email: Dirk.Neumann(a)zsm.mwn.de
postal address:
Bavarian Natural History Collections
The Bavarian State Collection of Zoology
Dirk Neumann, Section Ichthyology / DNA-Lab
Muenchhausenstr. 21
81247 Munich (Germany)
Visit our section at:
<a class="moz-txt-link-freetext" href="https://urldefense.proofpoint.com/v2/url?u=http-3A__www.zsm.mwn.de_ich_&d=CwMD-g&c=-dg2m7zWuuDZ0MUcV7Sdqw&r=CLFZJ3fvGSmDp7xK1dNZfh6uGV_h-8NVlo3fXNoRNzI&m=bBeg_gKbe8Yf6BW0qprgYgn5FgMvClqZrPJDlBD084s&s=zKPWJ2tIjj77TkLi6GRhu0NjSv5FXZuxtKF09RhyMe4&e=">http://www.zsm.mwn.de/ich/</a>
</pre>
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